KR20230133721A - Biodegradable eco-friendly clay including citrus extraction residue - Google Patents

Abstract

The present invention provides a natural pigment 1 obtained using 16 to 30% wt% of a structural agent selected from cellulose or pulp, 2.5 to 5 wt% of a binder, 10 to 30 wt% of citrus juice, fruits, vegetables, seaweed, or natural soil components. Provides biodegradable, eco-friendly clay containing citrus juice squeezed containing ~ 10 wt%, preservatives 0.5 ~ 10 wt%, and water 15 ~ 70 wt%. According to the present invention, by using citrus juice peel as the main material of clay, waste citrus peel can be recycled, the cost of clay production can be reduced, and safety and eco-friendliness can be improved by providing biodegradable natural clay.

Description

Biodegradable eco-friendly clay including citrus extraction residue}

The present invention relates to construction clay, and in detail, proposes a biodegradable, eco-friendly clay with improved functionality and workability using citrus juice peel, a waste resource.

Clay, clay, etc. are used as materials for sculptures and crafts, and are widely used for art textbooks, miniature production, decoration, etc. In particular, as the home fashion business for decorating the house has become active in recent years, its commercial value has been recognized, and clay and clay are used as materials for crafts. The range of use is expanding. Activities using clay or clay have great educational value as they can help children develop their physical and spatial abilities, scientific concept formation, pro-social behavior, emotional stability, language expression, and creativity. In other words, clay activities are great for children. It has a positive impact on overall development including physical, cognitive, social, emotional, language, and creativity.

Construction clay is flexible and can be easily transformed into the desired shape by hand, making it easy to manufacture various sculptures. When dried, it hardens and the product maintains its shape for a long time. Initially, high specific gravity inorganic materials collected from nature were used in this type of construction clay, but it is heavy and has a small water-holding capacity, so the molding time is short, and the cohesion of the particles is low even after drying, so the surface of the sculpture cracks or crumbles easily. There are problems such as losing. In addition, in order to reduce the weight of clay, clay was artificially manufactured using water-soluble natural polymers such as starch or their derivatives. However, when dried, the volume of the clay is greatly reduced, causing cracks in the sculpture, and in severe cases, splitting or crumbling, and coloring. This has the problem of being difficult, discoloring during drying, and leaving crumbs on hands during work.

Construction clay made of synthetic resin and artificial coloring was proposed. For example, a method is prepared by adding a predetermined amount of polyvinyl chloride, diethylhexylbutalate, dibutylbutalate, calcium carbonate, and polydimethylsiloxane (silicone rubber) to a stirrer, mixing and stirring, and heat treatment. proposed and used. In the case of such construction clay, it is mainly composed of chemicals and cannot be considered a hygienic and environmentally friendly product. In other words, most of the existing construction clays are made by mixing primary color chemicals or oxidized pigments and vinyl chloride resin, and have been detected to interfere with the endocrine system of children and contain heavy metals, so their use needs to be regulated. The main ingredients of clay or colored clay used as learning and play materials at home or in educational institutions are chemicals, so not only can they be harmful to the human body when used for long periods of time, but younger children often engage in dangerous behavior by inadvertently putting them in their mouths. .

To solve this problem, clay play compositions that are not harmful even when ingested by children have been developed. For example, Korean Patent Registration No. 10-0361019 discloses a plastic toy for children that contains wheat flour and is harmless even if ingested by the human body, and Korean Patent Publication No. 10-2010-0022675 discloses egg whites, sugar, coloring, flour and starch. A colored clay composition containing a mixture of powders is disclosed. However, this type of clay has lower physical properties compared to general clay, and has the disadvantage that it easily sticks to hands during work and bacteria can rapidly multiply.

As the use of construction clay increases, there is a need for the development of eco-friendly clay with improved functionality without harming the health of children and adults alike.

The present invention was created under the above-described technical background, and the purpose of the present invention is to provide an eco-friendly clay containing natural ingredients and reducing the content of chemical substances.

Another object of the present invention is to provide biodegradable clay that can be recycled and can naturally decompose even if discarded after use, contributing to environmental conservation.

Another object of the present invention is to provide a new clay that has excellent viscosity and shape forming properties and has excellent workability because it does not stick well to the skin during work.

Other purposes and technical features of the present invention will be presented in more detail in the detailed description below.

In order to achieve the above object, the present invention includes 16 to 40% wt% of a structural agent selected from cellulose or pulp, 2.5 to 5 wt% of a binder, 1 to 20 wt% of citrus juice, fruits, vegetables, seaweed, or natural soil components. Provides biodegradable, eco-friendly clay containing citrus juice peel, which is obtained as raw materials and contains 1 to 10 wt% of natural pigment, 0.5 to 5 wt% of preservative, and 20 to 79 wt% of water.

In the present invention, the citrus juice waste is a raw material obtained during processing of citrus fruits, and any one selected from citrus juice waste powder, citrus juice waste fermentation liquid, or citrus juice waste dehydration can be used.

In the present invention, it is preferable to use sodium chloride or a natural antibacterial agent extracted from citrus as the preservative.

In the present invention, the structural agent can be used as cellulose or pulp extracted from citrus juice or hoe-saeng-moe.

According to the present invention, by using citrus juice peel, organic waste, citrus juice peel, can be recycled, and the production cost of clay can be reduced while providing human-friendly clay.

The present invention also reduces the content of chemical substances and provides eco-friendly clay containing natural ingredients, so that even if discarded after use, it can naturally decompose and contribute to environmental preservation.

In particular, the eco-friendly clay of the present invention has excellent viscosity and formability and does not stick to the skin during work, so it has excellent workability. It contains preservatives that are harmless to the human body, improving durability and preservability, thereby suppressing the growth of bacteria and mold even after opening the package. The period of use of the product can also be improved.

Figure 1 is a flow chart of producing eco-friendly clay of the present invention
Figures 2a and 2b are photos showing the clay manufacturing process.
Figure 3 is a photograph of clay in which various colors were developed using natural dyes.
Figure 4 is a photograph of clay according to Example 1 of the present invention
Figure 5 is a photograph of clay according to Example 2 of the present invention

The present invention is a biodegradable, eco-friendly clay containing citrus juice, and proposes a new natural clay that can be used for art learning, craft activities, and interior design work.

In particular, the present invention provides eco-friendly clay that has improved safety and is biodegradable by recycling waste citrus peels. More than 600,000 tons of tangerines, Jeju Island's main agricultural product, are produced annually, and more than 10% of tangerines are used for processed foods such as juice. After processing, about 50,000 to 70,000 tons of tangerine peels are generated as waste. After juicing, citrus peels are difficult to dispose of due to their slow decay due to antioxidant components. If citrus peels are dumped in the ocean or buried in the soil, they can cause environmental problems such as marine pollution and soil and groundwater contamination. The citrus peel that remains after juice extraction is rich in fiber such as cellulose and pectin, and the citrus peel contains natural antibacterial substances. Due to the color of the citrus peel itself, it can also be used as a natural dye.

In the present invention, citrus peel is used as a raw material to provide the cellulose component of clay, a preservative component due to antibacterial substances, and a dye component, and as a result, it is possible to provide a new clay that is biodegradable and environmentally friendly. In addition, the eco-friendly clay of the present invention is softer to the touch and has superior viscosity than existing commercial clay, but unlike natural clay, it does not stick to the hand, making it easy to shape. In particular, the main materials are made of natural ingredients and contain no harmful chemical ingredients, making it very suitable for infants and children to engage in art activities using clay.

The eco-friendly clay of the present invention contains a structural agent containing cellulose, a binder, a pigment, and a preservative, and citrus peel can be used as part of the structural agent, pigment, and preservative. Specifically, the present invention is a natural product obtained from 16 to 40% wt% of a structural agent selected from cellulose or pulp, 2.5 to 5 wt% of a binder, 1 to 20 wt% of citrus juice, fruits, vegetables, seaweed, or natural soil components. We provide biodegradable, eco-friendly clay containing 1 to 10 wt% of pigment, 0.5 to 5 wt% of preservative, and 20 to 79 wt% of water.

Cellulose or pulp, which is used as a structural agent, serves as a dispersant in eco-friendly clay and is a major component of clay, maintaining its shape and strength like sand or gravel in concrete. Cellulose or pulp can be obtained from plants or wood, but the eco-friendly clay of the present invention can be used by extracting cellulose and pulp using waste resources such as citrus juice or hoe sap.

Binder is used to control the concentration of the basic base by mixing it with water in the process of manufacturing clay from natural ingredients, to bind structural agents, pigments, and preservatives, and to determine the viscosity of the final product. In an embodiment of the present invention Carboxymethyl cellulose (CMC) can be used as a binder, but it is not necessarily limited to this, and other materials can be used as long as they are naturally decomposable and eco-friendly. CMC is a water-soluble cellulose that has less than 0.8 sodium glycolate and ether groups per unit of cellulose molecule. When dissolved in water, it becomes a sticky liquid, and it has the property of preventing mold or mixing, so it can be stored for a long time. CMC is also used in foods such as ice cream and bread, cosmetics, and medicine, and because its safety has been confirmed, it is suitable as a raw material for clay products favored by infants and children.

Citrus juice extract, which is also used as a rescue agent, natural coloring agent, or preservative ingredient, can be made from raw materials obtained during citrus processing, such as citrus juice extract powder, citrus juice extract fermentation liquid, and citrus juice extract dehydrated, and is a solid powder that is dried and ground. The shape is suitable, but it may also contain some juice, which has the advantage of reducing the amount of water contained in the clay.

Colors made of natural dyes or pigments can be used as citrus peels themselves or pigments extracted from citrus fruits, or vegetables or natural soil components can be used, such as beet pigments, black-tailed lily extract pigments, blueberry pigments, and hydrangea pigments. , camellia flower pigments, Jeju volcanic clusters, etc. can be mixed with other clay ingredients to produce clay of various colors with outstanding natural beauty.

Preservatives prevent rot, such as mold growth, when an eco-friendly clay product is used for a long period of time after opening the packaging, and in the present invention, sodium-based preservatives or natural antibacterial substances extracted from citrus (tangerine peel, etc.) are used. In the case of sodium preservative, sodium chloride (NaCl), which is easily available on the market, can be used, but refined salt fine powder with fewer impurities is more suitable than the form of sea salt. In particular, sodium chloride not only acts as a preservative, but if infants or young children inadvertently ingest it during clay craft activities, they will immediately spit it out with a salty taste, which has the advantage of preventing safety accidents caused by clay. In the case of citrus-extracted antibacterial substances, limonene (D-Limonene) contained in citrus essential oil can be used, and it can be obtained by extracting the essential oil from tangerine peel using a distillation method.

In the eco-friendly clay of the present invention, the content range of the structural agent is required to maintain the strength and shape of the clay, the content range of the binder is required to maintain the shape of the clay and the viscosity of the final product, and the content range of the citrus juice peel is required to maintain eco-friendliness while replacing structural agents, colorants, and preservatives. In addition, the content range of natural pigments is necessary to not only express color but also perform some of the functions of a structural agent itself, and the content range of preservatives is necessary for long-term storage and prevention of spoilage of clay products. If the content range of each component proposed in the eco-friendly clay of the present invention is exceeded, the effect of the above-mentioned eco-friendly clay may be minimal or the physical properties of the clay may be reduced. Within the above-mentioned composition range, it is advantageous to increase the content of citrus juice as much as possible in terms of the physical properties of the overall clay, eco-friendliness, color, and manufacturing economics.

Figure 1 is a flowchart for producing eco-friendly clay of the present invention, and the detailed process for producing clay is as follows.

First, prepare the structural agent, binder, citrus juice peel, color, and preservative for each raw material (step S110). Cellulose is prepared with high purity, and pulp can be used to replace part or all of the cellulose. Citrus juice peel is prepared from dried solid powder, citrus juice peel fermentation liquid, and citrus juice peel dehydrated liquid. When replacing part of the cellulose in the total clay component or using it as a colorant or preservative, the mixing amount is increased. The prepared raw materials are measured and stored according to the above-mentioned ingredient mixing ratio.

Once the measured raw materials are prepared, first prepare the clay base (step S120). The base is prepared by mixing a binder in water and stirring it to form a liquid that maintains viscosity. Specifically, heated water at 70 to 95°C and binder are mixed in a mixing ratio and then stirred with a stirrer or kneader to ensure that the binder is evenly dissolved in water.

When the base is completed, cellulose or pulp is added as a structural agent and stirred sufficiently so that the structural agent is evenly dispersed in the base (step S130). Next, the citrus juice and pigment are added to the stirrer according to the mixing ratio described above, and stirred when the citrus juice is uniformly dispersed and the color of the clay is evenly expressed (step S140). Figure 2a shows raw materials being stirred during the clay manufacturing process.

Finally, sodium for preservative or natural antibiotic extracted from citrus for preservative is mixed according to the above mixing ratio and stirred sufficiently (step S150). After all raw materials have been sufficiently mixed and stirred, the clay is separated into appropriate amounts and packaged in small packages. For packaging, individual clays are wrapped in plastic or placed in small plastic containers to block contact with outside air. Figure 2b shows the finished clay packaged.

The eco-friendly clay of the present invention can be manufactured with excellent visual aesthetics using natural pigments obtained from fruits, vegetables, seaweed, or natural soil components. Figure 3 shows clay in various colors using natural dyes. In the present invention, the citrus juice peel serves not only as a structural agent but also as a pigment and preservative, so its content can be adjusted depending on the color of the clay. For example, when manufacturing yellow clay, the proportion of citrus juice can be relatively increased, and the proportion of other coloring ingredients or preservatives can be mixed by lowering the proportion.

Below, the technical features and effects of the biodegradable eco-friendly clay according to the present invention will be described in more detail through specific examples.

Example 1

0.35 kg of CMC as a binder, 2.9 kg of cellulose as a structural agent, 0.25 kg of tangerine powder as a part of the structural agent and a yellow coloring pigment, 0.3 kg of salt as a preservative, and 6.5 kg of water were prepared, respectively, and the eco-friendly clay was prepared according to the process of Figure 1 above. was manufactured.

To dissolve the binder, a working scale and container were prepared, and the measured water was heated to over 80°C using a heater. CMC was weighed and added to heated water and stirred with a rod for 10 minutes to ensure good mixing. After confirming that the binder was completely dissolved and mixed, it was stored for more than 10 hours.

For the clay dough, water and cellulose, which had developed viscosity by mixing the binder, were measured and slowly poured into the kneader, then the lid of the kneader was covered and the kneader was operated for 5 minutes. Next, tangerine powder was weighed, poured slowly, and stirred for 5 minutes. After checking that the color of the dough had developed well, the preservative was measured and poured slowly. The dough was operated for 20 minutes to check whether the dough was even and the dough was taken out.

In the clay composition, citrus juice extract powder provided lignin and cellulose to modify the structural properties of the clay. As a result, the amount of cellulose and CMC required for mixing was reduced, and natural pigments and natural antibacterial properties were also provided. Figure 4 is a photograph of the clay according to this example, and it was confirmed that it was soft like flour dough, had good viscosity, and had excellent tactile feel.

Example 2

0.35 kg of CMC as a binder, 2.5 kg of cellulose as a structural agent, 0.2 kg of tangerine powder as a part of the structural agent and some pigment, 0.45 kg of black-tailed moss powder as a part of the main pigment and structural agent, 0.3 kg of salt, and 6.5 kg of water as a preservative. Each was prepared, and eco-friendly clay was manufactured similarly to the process of Example 1 according to the process of FIG. 1.

We made green colored clay using a hoe hat and molded the clay in different shapes to check the viscosity, degree of stretching, and shape stability. Figure 5 shows a photograph of clay according to Example 2. While the appropriate viscosity was maintained, the clay did not stick to the hands, making it easy to handle and change shape.

The clay of the present invention can recycle bio-waste citrus juice peel by using it as a raw material for structural agents, pigments, and preservatives, and has the effect of increasing eco-friendliness and human compatibility while reducing the cost of producing the clay. In particular, the problem of existing biodegradable clays being shortened by bacteria and mold growing rapidly after opening has been improved, and it can also help the health of infants and children by not using chemical preservatives that are harmful to the human body.

Although the present invention has been illustratively described above through preferred embodiments, the present invention is not limited to these specific embodiments and can be used in various forms within the scope of the technical idea presented in the present invention, specifically the scope of the patent claims. It may be modified, changed, or improved.

Claims (4)

16 to 40% wt% of structuring agent selected from cellulose or pulp,
Binder 2.5 ~ 5wt%,
Citrus juice extract 1 ~ 20wt%,
1 to 10 wt% of natural pigment obtained from fruits, vegetables, seaweed, or natural soil components,
preservative 0.5 to 5 wt%, and
Consisting of 20 to 79 wt% water
Biodegradable, eco-friendly clay containing citrus juice.
According to paragraph 1,
The citrus juice waste is a raw material obtained during citrus processing and is selected from the group consisting of citrus juice waste powder, citrus juice waste fermentation liquid, and citrus juice waste dehydration. A biodegradable, eco-friendly clay containing citrus juice waste.
According to paragraph 1,
The preservative is a biodegradable, eco-friendly clay containing citrus juice, wherein the preservative is sodium chloride or a natural antibacterial agent extracted from citrus.
According to paragraph 1,
The structural agent is a biodegradable, eco-friendly clay containing citrus juice, characterized in that it is cellulose or pulp extracted from citrus juice or hoe saengmoe.